---
title: 'Senior Applied Research Engineer - Video at Synthesia'
canonical: 'https://feeny.ai/job/senior-applied-research-engineer-video-synthesia-europe-y7bazh5wew18'
type: 'job'
last_seen: '2026-09-08'
---

# Senior Applied Research Engineer - Video at Synthesia

- **Company:** [Synthesia](https://feeny.ai/companies/synthesia)
- **Location:** Europe
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-08-24
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.ashbyhq.com/synthesia/18acb910-bacb-4255-aab5-98d6f32b7f3a

## Job description

Synthesia is the world’s leading AI video platform for business, used by over 90% of the Fortune 100. Founded in 2017, the company is headquartered in London, with offices and teams across Europe and the US.

As AI continues to shape the way we live and work, Synthesia develops products to enhance visual communication and enterprise skill development, helping people work better and stay at the center of successful organizations.

Following our recent Series E funding round, where we raised $200 million, our valuation stands at $4 billion. Our total funding exceeds $530 million from premier investors including Accel, NVentures (Nvidia's VC arm), Kleiner Perkins, GV, and Evantic Capital, alongside the founders and operators of Stripe, Datadog, Miro, and Webflow.

## ABOUT THE ROLE

As an Applied Research Engineer in our Video team, you will help build the next generation of production-grade foundation models for human-centric video generation.

You will join a highly focused team working at the intersection of large-scale generative modeling, distributed systems, and production engineering. Our mission is to develop and optimize video base models that power realistic, controllable, and emotionally expressive synthetic humans at scale.

This is not pure research. This is applied research with direct product impact.

You will work on advancing training recipes, scaling distributed systems, improving evaluation frameworks, and optimizing inference to ensure our models are high quality, stable, and efficient enough for real-world deployment. Your work will directly influence models used by tens of thousands of businesses worldwide.

## What you’ll do

You will own and execute end-to-end research and engineering projects, from hypothesis to production impact. This includes:

- Developing and scaling latent video diffusion models tailored for human-centric video generation
- Designing conditioning mechanisms to improve control (pose, emotion, script, camera) without sacrificing fidelity
- Advancing distributed training strategies (DDP, FSDP, DeepSpeed, sequence parallelism) under real compute constraints
- Improving training stability at multi-node scale
- Designing rigorous evaluation frameworks combining automated metrics and structured human evaluation
- Optimizing inference for low latency, high resolution, and cost efficiency
- Running controlled ablations and experiments to drive high-signal modeling decisions
- Contributing to high engineering standards: reproducibility, experiment tracking, CI/CD, monitoring

You will be expected to move fast, run multiple hypotheses in parallel, identify signal early, and focus on outcomes rather than exploration for its own sake.

## What we’re looking for

## MUST-HAVE

- Strong experience training deep learning models at scale
- Strong Python and PyTorch skills
- Hands-on experience with diffusion models (image domain required; video preferred)
- Experience with large scale multi-GPU / multi-node training
- Good understanding of distributed training (DDP, FSDP, DeepSpeed or similar)
- Ability to design controlled experiments and interpret noisy results

## NICE-TO-HAVE

- Experience with video diffusion models
- Experience in avatar or human-centric generation
- Familiarity with world / interactive models
- Experience with GANs or VAEs

## Experience optimizing inference systems for production

## OUR STACK

- Python, PyTorch, CUDA
- DeepSpeed, distributed training & inference
- Sequence parallelism
- AWS, SLURM, Docker
- GitHub, CI/CD pipelines

## WHO YOU ARE

- You are research-driven but outcome-focused
- You care about shipping, not just publishing
- You can explore multiple ideas quickly and drop low-signal directions early
- You communicate clearly and present results scientifically
- You operate independently but collaborate actively across teams

WHY JOIN US?

- Build production-scale video foundation models in a fast-growing Generative AI company
- Work on human-centric video generation with real-world impact
- Tackle hard problems in scaling, stability, and controllability
- Influence the direction of next-generation synthetic human technology
- Join a highly technical, high-ownership environment where your work ships

If you want to work on cutting-edge generative video models and see your research power real-world products, we’d love to talk.

Our culture

At Synthesia we’re passionate about building, not talking, planning or politicising. We strive to hire the smartest, kindest and most unrelenting people and let them do their best work without distractions. Our work principles serve as our charter for how we make decisions, give feedback and structure our work to empower everyone to go as fast as possible. You can find out more about these principles here. https://www.notion.so/How-we-work-at-Synthesia-f794caa72f8446efb6be22b551ce0fa2?pvs=21

SERVING 50,000+ CUSTOMERS (AND 50% OF THE FORTUNE 500)

We’re trusted by leading brands such as Heineken, Zoom, Xerox, McDonald’s and more. Read stories from happy customers https://www.synthesia.io/case-studies and what 1,200+ people say on G2 https://www.g2.com/products/synthesia/reviews#reviews.

## PROPRIETARY AI TECHNOLOGY

Since 2017, we’ve been pioneering advancements in Generative AI. Our AI technology is built in-house, by a team of world-class AI researchers and engineers. Learn more about our AI Research Lab and the team behind. https://www.synthesia.io/research

## AI SAFETY, ETHICS AND SECURITY

AI safety, ethics, and security are fundamental to our mission. While the full scope of Artificial Intelligence's impact on our society is still unfolding, our position is clear: People first. Always. Learn more about our commitments to AI Ethics, Safety & Security https://www.synthesia.io/ethics.

## About Synthesia

## Company Overview
- **One-liner**: Synthesia is an all-in-one AI video platform that enables businesses to create, localize, manage, and publish professional-quality videos using AI avatars and voiceovers, without any filming equipment or video editing skills.
- **Entity Type**: Private (Series C)
- **Headquarters**: London, United Kingdom
- **Founded**: 2017
- **Founders**: Victor Riparbelli (CEO), Prof. Lourdes Agapito, Steffen Tjerrild (COO), Prof. Matt Niessner

## Core Business
- **Primary industry**: AI Video Platform / Enterprise SaaS / Creative Technology
- **Target customers**: B2B, Enterprise (trusted by 50,000+ teams globally, including 90% of the Fortune 100)
- **Mission statement**: "Helping people work better" — transforming how organizations train, onboard, and upskill their employees with AI.

## Products & Services
- **Synthesia AI Video Platform (Core)**: Full-stack SaaS platform for creating AI videos. Includes AI avatars (240+), AI voices in 160+ languages, 1-click translation, real-time team collaboration, version control, brand kit management, analytics (views, drop-offs, completion rates), and SCORM export for LMS integration.
- **AI Avatars**: Customizable, expressive AI avatars that speak 160+ languages. Users can also create their own custom avatar.
- **AI Screen Recorder**: Polished screen recordings with instant transcripts (removes 'ums' and 'uhs'), editable and translatable.
- **Multilingual Video Player**: Single player to watch and organize videos in 160+ languages.
- **AI Video Assistant & Academy**: Tutorials and onboarding tools to help users create videos quickly.
- **Enterprise Security Suite**: SOC 2 Type II, GDPR, ISO 42001 compliant, with SAML/SSO. Designed to satisfy the toughest legal and security teams at Fortune 100 companies.

## Market Standing
- **Valuation/ Market Cap**: Not publicly disclosed (last known funding round: Series C, $180M raised, led by Accel and Nvidia in 2023, valuing the company at $1B+ — Unicorn status).
- **Key Metric**: **$100M+ Annual Recurring Revenue (ARR)** — announced by COO & Co-founder Steffen Tjerrild in a public LinkedIn post [linkedin.com](https://www.linkedin.com/posts/steffentjerrild_probably-the-milestone-im-most-proud-of-activity-7317848922612224001-UuZ1)
- **Notable Investors/Partners**: Accel, Nvidia (lead Series C), with previous investors including Kleiner Perkins, GV, FirstMark Capital, and MMC Ventures. The company has an active partnership ecosystem including integrations with LMS providers and enterprise tooling.
- **Growth Signals**: 
  - Crossed $100M ARR (strong product-market fit and revenue growth).
  - Used by 90% of the Fortune 100 and 50,000+ teams.
  - Engineering team scaled from 0 to 80+ engineers.
  - Over 1M+ users on the platform.
  - Hiring in 26+ countries with offices in London and NYC.
  - Continues to expand product suite (AI avatars, video agents, analytics, and skill development products).

## Competitive Advantages
- **Proprietary AI & Avatars**: Deep AI research spanning computer vision, graphics, and NLP (co-founders from Stanford, Cambridge, UCL, TUM). Avatars are highly expressive and support 160+ languages with accurate lip-sync.
- **Enterprise Security & Compliance**: SOC2, GDPR, ISO42001, SAML/SSO — a key differentiator for Fortune 100 clients who require stringent security.
- **End-to-End Platform**: Combines creation, localization, management, analytics, and version control in one tool — reducing reliance on multiple vendors and agencies.
- **AI Ethics-First**: 10% of the team is dedicated to AI safety and ethics, a strong trust signal for enterprise buyers.
- **Velocity & Innovation**: Engineering team delivers meaningful features every few days, not weeks, enabling rapid iteration.

## Strategic Focus
- **Enterprise Scale & Platform Depth**: Deepening integrations with enterprise tooling (LMS, security suites) and expanding video product suite (Avatars, Agents, skill development).
- **Global Localization**: Strengthening 160+ language support and 1-click translation to serve multinational enterprises.
- **AI Ethics & Trust**: Maintaining a dedicated ethics team and proactive AI policy engagement to stay ahead of regulation and build customer trust.
- **Product Expansion**: Moving from video creation to a broader "visual communication" platform including AI Agents and analytics-driven optimization.
- **Talent Acquisition**: Scaling the global team across engineering, research, and go-to-market functions, with a focus on high-velocity engineering culture.

## Why Work Here
- **Global & Remote-First Culture**: Team spans 26+ countries. Offices in London and NYC, with remote work flexibility. Roughly 80% of London HQ staff are immigrants, fostering a diverse, international environment.
- **High-Velocity Engineering**: Engineers deliver meaningful features every few days (no long releases). Minimal meetings and SCRUM ceremonies — a focus on building and shipping.
- **Growth & Ownership**: Real ownership from day one. Clear progression paths, annual learning budget, access to courses and conferences.
- **People-First & AI Ethics**: 10% of team dedicated to AI safety. Strong emphasis on work-life balance with competitive compensation, PTO, and benefits.
- **H-1B Friendly**: CEO Victor Riparbelli has publicly highlighted that the London office provides a strong alternative to US visa uncertainty, with ~80% of staff being immigrants.
- **Top-Tier Team**: Founders and engineering leadership from Stanford, Cambridge, UCL, TUM, and top tech companies.

## Sources
1. [synthesia.io/about](https://www.synthesia.io/about)
2. [synthesia.io](https://www.synthesia.io/)
3. [synthesia.io/careers](https://www.synthesia.io/careers)
4. [linkedin.com/company/synthesia-technologies](https://uk.linkedin.com/company/synthesia-technologies)
5. [pitchbook.com/profiles/company/267090-49](https://pitchbook.com/profiles/company/267090-49)
6. [linkedin.com/posts/steffentjerrild](https://www.linkedin.com/posts/steffentjerrild_probably-the-milestone-im-most-proud-of-activity-7317848922612224001-UuZ1)
7. [linkedin.com/posts/victorriparbelli](https://www.linkedin.com/posts/victorriparbelli_h-1bs-are-causing-a-lot-of-uncertainty-right-activity-7375861659610836993-UULl?utm_source=share&utm_medium=member_desktop&rcm=ACoAABVaNoYBu2QiVriT0MMLe-cbAPv2sPNI2cA)

## Other roles at Synthesia

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- [Head of Product Marketing](https://feeny.ai/job/head-of-product-marketing-synthesia-london-90xzmtg7s16x) — London, United Kingdom
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- [Social Media Associate](https://feeny.ai/job/social-media-associate-synthesia-london-j35mw2hqg7dh) — London, United Kingdom
- [Senior Commercial Counsel](https://feeny.ai/job/senior-commercial-counsel-synthesia-new-york-rebvt4wn5dxz) — New York, NY
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